Android Q 使用通知栏消息

String myChannelId = "iot";
                String myChannelName = "告警通知服务";
                NotificationManager manager = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
                Notification notification = null;
                if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                    NotificationChannel channel = new NotificationChannel(myChannelId, myChannelName,
                            NotificationManager.IMPORTANCE_LOW);
                    Toast.makeText(this, myChannelId, Toast.LENGTH_SHORT).show();
                    manager.createNotificationChannel(channel);
                    notification = new NotificationCompat.Builder(this, myChannelId)
                            .setContentTitle("测试")
                            .setContentText("一个新消息")
                            .setWhen(System.currentTimeMillis())
                            .setShowWhen(true)
                            .setSmallIcon(R.mipmap.ic_launcher)
                            .setLargeIcon(BitmapFactory.decodeResource(getResources(),R.mipmap.ic_launcher))
                            .build();
                }else {
                    notification = new NotificationCompat.Builder(this, myChannelId)
                            .setContentTitle("This is a title")
                            .setContentText("This is a context")
                            .setWhen(System.currentTimeMillis())
                            .setSmallIcon(R.mipmap.ic_launcher)
                            .setLargeIcon(BitmapFactory.decodeResource(getResources(), R.mipmap.ic_launcher))
                            .build();
                }
                manager.notify(1, notification);